Well down here in south-west Western Australia its mainly mosquitoes and perhaps ticks (only annoying ticks here on this side of the continent, none are particularly poisonous, not like in NSW). Snakes at night only when extremely hot, but I've not encountered any during my sessions. Foxes might have a go at your food if you're camping but that's more a nuisance than a physical threat.
However if you go up north to the Pilbara and Kimberley you would be wise to look out for nocturnal snake activity, I've heard a few stories of people sleeping on the ground in swags and waking up with snake in bed with them. Best to sleep on a camp bed or in a tent you can zip up.
But there are those persistant stories of rogue black panthers living in the forests of the southwest, but of course no one can provide any proof...
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